Abstract
The power function of basal metabolic rate scaling is expressed as aMb, where a corresponds to a scaling constant (intercept), M is body mass, and b is the scaling exponent. The 3/4 power law (the best-fit b value for mammals) was developed from Kleiber's original analysis1 and, since then, most workers have searched for a single cause to explain the observed allometry. Here we present a multiple-causes model of allometry, where the exponent b is the sum of the influences of multiple contributors to metabolism and control. The relative strength of each contributor, with its own characteristic exponent value, is determined by the control contribution. To illustrate its use, we apply this model to maximum versus basal metabolic rates to explain the differing scaling behaviour of these two biological states in mammals. The main difference in scaling is that, for the basal metabolic rate, the O2 delivery steps contribute almost nothing to the global b scaling exponent, whereas for the maximum metabolic rate, the O2 delivery steps significantly increase the global b value.
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Acknowledgements
P.W.H. and R.D.A. were supported by the NSERC, Canada; R.K.S. by the NSF in the USA. C.-A.D. was an NSERC and FCAR pre-doctoral fellow.
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Darveau, CA., Suarez, R., Andrews, R. et al. Allometric cascade as a unifying principle of body mass effects on metabolism. Nature 417, 166–170 (2002). https://doi.org/10.1038/417166a
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DOI: https://doi.org/10.1038/417166a
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